A telescope is an amazing device that has the ability to make faraway objects appear much closer.
The telescops you see more today are the refractor telescope, which uses glass lenses
The reflector telescope, which uses mirrors instead of the lenses.
A telescope's ability to collect light is directly related to the diameter of the lens or mirror -- the aperture -- that is used to gather light. Generally, the larger the aperture, the more light the telescope collects and brings to focus, and the brighter the final image.
The telescope's magnification, its ability to enlarge an image, depends on the combination of lenses used. The eyepiece performs the magnification. Since any magnification can be achieved by almost any telescope by using different eyepieces, aperture is a more important feature than magnification.
A telescope is an amazing device that has the ability to make faraway objects appear much closer.
A telescope's ability to collect light is directly related to the diameter of the lens or mirror -- the aperture -- that is used to gather light. Generally, the larger the aperture, the more light the telescope collects and brings to focus, and the brighter the final image.
The telescope's magnification, its ability to enlarge an image, depends on the combination of lenses used. The eyepiece performs the magnification. Since any magnification can be achieved by almost any telescope by using different eyepieces, aperture is a more important feature than magnification.
http://www.youtube.com/watch?v=zVEnZDFV_nM
http://www.howstuffworks.com/telescope1.htm
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